[英]How to send Response back to Servlet from another Servlet
I have written two servlet residing on different web server. 我已经在不同的Web服务器上编写了两个servlet。 Sending Request from Servlet1(Server1) using URL object in java. 使用Java中的URL对象从Servlet1(Server1)发送请求。 And successfully able to call the Servlet2(server2). 并成功调用了Servlet2(server2)。 But i need to send the response back to Servlet1 from Servlet2 also...How can i achieve that. 但是我也需要将响应从Servlet2发送回Servlet1 ...我该如何实现。 Please help me. 请帮我。
UPDATE UPDATE
Here is the code for test.... 这是测试代码。
Servlet1: Servlet1:
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Inside MyServlet.");
String urlParameters = "param1=a¶m2=b¶m3=c";
byte[] postData = urlParameters.getBytes( StandardCharsets.UTF_8 );
int postDataLength = postData.length;
String requestURL = "http://localhost:8080/Application2/Servlet2";
URL url = new URL( requestURL );
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setDoOutput( true );
conn.setInstanceFollowRedirects( false );
conn.setRequestMethod( "POST" );
conn.setRequestProperty( "Content-Type","application/x-www-form-urlencoded");
conn.setRequestProperty( "charset", "UTF-8");
conn.setRequestProperty( "Content-Length", Integer.toString( postDataLength ));
conn.setUseCaches( false );
ObjectOutputStream out = new ObjectOutputStream(conn.getOutputStream());
out.write( postData );
conn.connect();
}
Servlet2: Servlet2:
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Inside CallToAuthorize.Getting Access Token.");
//do something here and send the response back to Servlet1.
//Primarily i will be sending String back to Servlet1 for its request.
}
Your Servlet2, the Request-Receiver, should behave normally: 您的Servlet2,即Request-Receiver,应正常运行:
A basic example: 一个基本的例子:
public class Servlet2 extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/plain; charset=UTF-8");
response.getWriter().append("That is my response");
}
}
Your Client, the Request-Sender, should process the response: 您的客户(请求发送者)应处理响应:
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
System.out.println("SUCCESS");
}
else {
System.out.println("Response Code: " + responseCode);
}
// may be get the headers
Map<String, List<String>> headers = connection.getHeaderFields();
// do something with them
// read the response body (text, html, json,..)
// do something usefull
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
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